Fossils/Geo Time

Front

Longest subdivision in the geo time scale that is based on the abundance of certain types of fossils

Back

Eon

Front

Paleozoic, Mesozoic, and Cenozoic are classified as _________

Back

Eras

Front

Longest part of Earth's history, lasting from 4 billion to about 544 million years ago.

Back

Precambrian

Front

A break or gap in the sequence of a series of rock layers due to erosion

Back

Unconformity

Front

List the expanses of time in the Geologic Time Scale in order from longest to shortest: Eon, Period, Era, Epoch

Back

Eon, Era, Period, Epoch

Front

Name the first organism to appear on Earth: worms, jellyfish, fish, cyanobacteria

Back

cyanobacteria

Front

This fossil lived in many different places on Earth but only for a short period of time

Back

index fossil

Front

Process in which some atoms or isotopes break down into other isotopes & particles

Back

Radioactive decay

Front

The age of something when compared with the position of different rock layers

Back

relative age

Front

Radioactive decay of material can be used to determine the age of fossils. This is called ____________

Back

absolute dating